Western Astrology · Synastry

Real compatibility.
Real charts.

Synastry isn't Aries + Libra — it's the whole sky of two people, laid one over the other. Shymea reads both charts together. Every planet-to-planet aspect, every house overlay, the composite chart of the relationship itself. The answer isn't a score out of ten. It's a map of what's actually happening between you.

What synastry actually is

A method, not a horoscope.

Synastry is the branch of Western astrology that studies how two people's birth charts interact. Instead of asking the internet whether your sun sign matches your partner's — a question so reductive it's almost a party trick — a synastry reading overlays the two full charts and examines the actual geometry between them.

That means every planet in your chart is compared, by degree, to every planet in theirs. Does your Venus touch their Mars? Does their Moon sit exactly on your Ascendant? Is there a Saturn-Sun contact that tells you this relationship will teach you patience whether you wanted that lesson or not? These are the real questions a compatibility chart answers, and they have nothing to do with whether your elements get along on paper.

There are three layers a proper synastry reading works through. Inter-chart aspects — the angles between your planets and theirs — show the chemistry, the friction, the attraction, the arguments. House overlays — which of your houses their planets fall into, and vice versa — show which rooms of your life each person activates. The composite chart, derived from the midpoints of both charts, is the chart of the relationship itself, as though it were a third person with its own personality and its own fate.

Sun-sign compatibility asks one question with twelve answers. Real synastry asks hundreds of questions and gives you a portrait. That's the difference between "Capricorns and Cancers are opposites" and "your Venus at 8° Capricorn is square their Mars at 9° Aries — which is why this either builds something that lasts or breaks in two years, and you can see exactly why from the angle."

What Shymea calculates

The whole chart. Both charts.

Synergy score.

A single number from the whole chart math — weighted across aspects, house overlays, and composite resonance. Not a gimmick. A starting point.

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Aspect breakdown.

Every meaningful planet-to-planet aspect by degree and orb — Venus square Mars, Sun trine Moon, Saturn conjunct Venus. The chemistry, named.

House overlays.

Where your chart lands in theirs — and theirs in yours. Which room of their life you walk into. Which room of yours they light up.

Composite chart.

The chart of the relationship itself — built from the midpoints of both. Not you. Not them. The thing you make together.

A sample reading

What a real insight sounds like.

Inter-chart aspect

Your Venus in Capricorn · square · Their Mars in Aries

They move fast. You move carefully. The friction isn't a problem — it's the lesson. A square doesn't mean broken. It means this aspect wants work before it gives you its gold.

Orb 1.2° · Weight heavy · Longevity marker

Essays on compatibility

Long-form reading, free.

Frequently asked

About synastry and compatibility.

What is synastry in astrology?+
Synastry is the practice of comparing two birth charts to see how two people interact astrologically. You overlay one chart onto the other and read the planet-to-planet aspects, the house overlays, and the composite chart — the chart of the relationship itself. Sun-sign matching asks one question. Synastry asks hundreds.
How is synastry different from sun-sign compatibility?+
Sun-sign compatibility uses one placement per person — the Sun — and asks whether two elements get along. Synastry uses every planet, house, and angle in both charts. Two Aries can be wildly incompatible. Two sun-sign opposites can be the love of each other's lives. Sun signs are a headline; synastry is the whole article.
Do I need my partner's exact birth time?+
For the most accurate reading, yes — birth time determines the Moon placement, the rising sign, and all twelve houses. Without a birth time, Shymea can still analyze sign placements and most planet-to-planet aspects, but the house overlays and Moon-level emotional compatibility will be approximate.
Can synastry tell me if a relationship will work?+
Synastry shows you the dynamic — where the chemistry is, where the friction is, what the relationship is actually about at a structural level. It doesn't hand you a yes-or-no verdict, because no chart can. What it does is replace guessing with seeing: you understand the pattern, and then you choose.
Is the compatibility report free?+
Shymea is in pre-launch. Everyone on the waitlist gets early access to the synastry and compatibility features the moment the app opens. Pricing for longer-form reports will be announced at launch — the waitlist is always free.
Early access

Two charts. One reading.

Shymea's synastry and composite engine is in its final stretch before launch. Leave your email — we'll write to you the moment you can read two charts together.

Your sky, and theirs. No spam — just the launch.